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United States Patent | 6,145,625 |
Prokop ,   et al. | November 14, 2000 |
A lubricator for delivering grease lubricant to lubricating locations of a machine is coupled to a grease container and has a work chamber in which a delivery piston reciprocates. To ensure that a compressible medium, such as air which has been drawn into the work chamber is rapidly expelled therefrom, the work chamber is divided by a grease return device into a compressing portion and a delivery portion. Triggered by a sufficiently high pressure level which prevails in the compressing portion and which is present only during grease delivery, an otherwise blocked return connection is established between the compressing portion and a supply port which couples the grease container to the work chamber, as long as the head of the delivery piston, in the course of its grease delivery stroke (forward stroke) is situated in the compressing portion.
Inventors: | Prokop; Heinz-Jurgen (Essen, DE); Deimel; Thomas (Essen, DE); Zumbach; Ferdinand (Haan, DE) |
Assignee: | Krupp Bautechnik GmbH (Essen, DE) |
Appl. No.: | 021366 |
Filed: | February 10, 1998 |
Feb 10, 1997[DE] | 197 04 958 |
Current U.S. Class: | 184/27.1; 184/105.2; 417/307; 417/489 |
Intern'l Class: | F16N 007/14 |
Field of Search: | 184/6.14,6.4,29,28,27.1,105.1,105.2 417/307,489,570 137/565.35 |
3291350 | Dec., 1966 | Malec | 417/489. |
3599753 | Aug., 1971 | Walsh | 184/29. |
3939943 | Feb., 1976 | Salmi | 184/6. |
4589825 | May., 1986 | Schmidt | 417/307. |
4738595 | Apr., 1988 | Gaiser | 417/307. |
4739854 | Apr., 1988 | Sabel et al. | 417/307. |
5060761 | Oct., 1991 | Arndt et al. | 184/6. |
5449051 | Sep., 1995 | Liao | 184/6. |
5570868 | Nov., 1996 | Flaming | 184/29. |
Foreign Patent Documents | |||
0 288 981 | Nov., 1988 | EP. | |
866 746 | Feb., 1953 | DE. | |
23 19 249 | Oct., 1974 | DE. | |
35 12 020 | Oct., 1986 | DE. |